x86-64 va_arg

include/llvm/CodeGen/MachineInstrBuilder.h

Index: include/llvm/CodeGen/MachineInstrBuilder.h
===================================================================
--- include/llvm/CodeGen/MachineInstrBuilder.h	(revision 116297)
+++ include/llvm/CodeGen/MachineInstrBuilder.h	(working copy)
@@ -18,6 +18,7 @@
 #define LLVM_CODEGEN_MACHINEINSTRBUILDER_H
 
 #include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/Support/ErrorHandling.h"
 
 namespace llvm {
 
@@ -122,6 +123,13 @@
     return *this;
   }
 
+  const MachineInstrBuilder &setMemRefs(MachineInstr::mmo_iterator b,
+                                        MachineInstr::mmo_iterator e) const {
+    MI->setMemRefs(b, e);
+    return *this;
+  }
+
+
   const MachineInstrBuilder &addOperand(const MachineOperand &MO) const {
     MI->addOperand(MO);
     return *this;
@@ -136,6 +144,19 @@
     MI->addOperand(MachineOperand::CreateMCSymbol(Sym));
     return *this;
   }
+
+  // Add a displacement from an existing MachineOperand with an added offset.
+  const MachineInstrBuilder &addDisp(const MachineOperand &Disp,
+                                     int64_t off) const {
+    switch (Disp.getType()) {
+      default:
+        llvm_unreachable("Unhandled operand type in addDisp()");
+      case MachineOperand::MO_Immediate:
+        return addImm(Disp.getImm() + off);
+      case MachineOperand::MO_GlobalAddress:
+        return addGlobalAddress(Disp.getGlobal(), Disp.getOffset() + off);
+    }
+  }
 };
 
 /// BuildMI - Builder interface.  Specify how to create the initial instruction